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2 years ago

Solve for X if MN =81 A)9 B)10 C)11 D)12

Mathematics

1 answer:

ValentinkaMS [17]2 years ago

6 0

Answer:

Step-by-step explanation:

You can see, MN consists of the three lines in the picture. So you just need to sum them tougher in an equation with it's original value 81.

5 + 3x - 8 + 4x = 81

7x = 81 + 3

7x = 84 / : 7

x = 12

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2 years ago

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luda_lava [24]

Answer:

Step-by-step explanation:

Let's start by rewriting the second equation in terms of "x":

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Now, substitute "5-y" for "x" in the first equation:

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Cancel out like terms:

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Subtract 25 from both sides:

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2 years ago